For this case we have the following equation:
[tex]4n-2n = 18[/tex]
We add similar terms from the left side of the equation, taking into account that different signs are subtracted and the major sign is placed. So:
[tex]2n = 18[/tex]
We divide between 2 on both sides of the equation:
[tex]n = \frac {18} {2}\\n = 9[/tex]
Answer:
[tex]n = 9[/tex]
Option C
